1. College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, P. R. China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chendu University of Technology, Chendu 610059, P. R. China
3. Shaanxi Cooperative Innovation Center of Unconventional Oil and Gas Exploration and Development, Xi’an Shiyou University, Xi’an 710065, P. R. China
4. No. 203 Research Institute of Nuclear Industry, Xianyang 712000, P. R. China